유연기판을 이용한 유기 태양전지 제작 및 특성 평가에 관한 연구

Abstract

Into the information Age, the importance of electronic display industry is growing. Among them, Flexible organic optoelectronic devices such as organic light emitting diodes (OLEDs) for displays and organic solar cells (OSCs) require that flexible and transparent conducting electrodes (TCEs) having high transparency and conductivity be fabricated on flexible substrates. But, crystal-like indium-doped tin oxide (c-ITO), the material most normally used for TCEs, is not the most suitable for the fabrication of such electrodes for large-area flexible displays because it is brittle and cracks easily under bending stress. Therefore, apply to flexible display require to enhanced TCEs and flexible substrates. In this study, using flexible substrates such as PET, PES, PI and improved bending and electrical characteristics metal grid embedded PI and TCE deposition used DC-RF magnetron sputtering method using ITO target by thickness (20 nm, 100 nm) were deposited, Fabricated samples tested optical, electrical, and bending characteristics. In addition, organic solar cells, structure of flexible substrates (PI or metal grid embedded PI)/ITO/PEDOT: PSS/PBDTTT-C:PC60BM/Al was fabricated. As a result, flexible substrates and ITO deposited flexible substrates transmittance of more than 90%, and the sheet resistance of ITO 20 nm in 250 Ω/cm2, ITO100 nm in 50 Ω/cm2, ITO 20 nm/ metal grid embedded PI in 14 Ω/cm2 were measured and the percentage change in the resistance of the flexible electrode, metal grid embedded PI resistance change was less. The results of the efficiency of organic solar cells, metal grid embedded PI power conversion efficiency (PCE) of 4.006 ± 0.116% up to the cell area of 0.64 cm2 under AM 1.5 (1 sun) simulated illumination with an intensity of 100 mW/cm2 and after bending test, conventional efficiency of 3.5%(3.901% ± 0.124%) was reduced and fabricated large-area cell (50 x 50size) of PCE 2.55% was able to get excellent results.